Question 325273
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The equation *[tex \Large x\ =\ -5] describes the set of all ordered pairs *[tex \Large (x, y)] such that nobody cares what *[tex \Large y] is, so long as *[tex \Large x\ =\ -5].


Therefore, *[tex \Large (-5,y_1)] and *[tex \Large (-5,y_2)] represent two elements of such a set.  Given two points on a line, you can compute the slope of the line:


*[tex \LARGE\ \ \ \ \ \ \ \ \ \ m\ =\ \frac{y_1\ -\ y_2}{(-5)\ -\ (-5)}].


That is a rational expression with a zero denominator.  What do you know about expressions with a zero denominator?



John
*[tex \Large e^{i\pi}\ +\ 1\ =\ 0]
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